Improvement in the manufacture of building-blocks from slag



fitnitid slam palm difliiirr.

CHARLES DIEBOLD, OF LEBANON, PENNSYLVANIA, AS SIGNOR TO E. L,BUTTERFIELD, TRUSTEE, OFBROOKLYN, NEW YORK;

\ Letters Patent No. 101,835, dated April 12, ism.

IMPROVEMENT IN THE MANUFACTURE OI BUILDING-BLOCKS PROM SLAG.

The Schedule referred to in these Letters Patent and making part of thesame.

1, CHARLES DIEBOLD', of Lebanon, Lebanon county, State of Pennsylvania,have invented a certain Improvement in the Process of ManufacturingBuilding- Blocks or other Articles from Slag, of which the following isa specification or description.

In the method now in use, the flasks or molds are taken at the propertime to the iron-furnace, and the melted slag is drawn directly intothem and left to cool andharden therein, but this process requires agreat number of molds, owing to the time required for the slag to cool,and moreover, the blocks thus produced are hard and brittle, especiallywhen the air is permitted to reach the block during the process ofcooling. I

I have found that by retarding the cooling-process and confining theblocks from the air, the defects mentioned are remedied. Toaccomplishthis, I pursue the following course:

When the slag is drawn into the flasks or molds it is allowed to remainjust long enough to solidify to such an extent that it can be movedwithout the molds, when I rake the molds from the blocks, and

then remove the blocks and pile them up in heaps and cover them withsand or other material to exclude the air, where they are allowed toremain till cold. In case it is not desired to remove the molds, theycan be covered, and the air excluded while the blocks cool in them. Bythis process the blocks produced are rendered tough as well as hard, sothat they can be dressed the same as any building-stone.

Ha-ving described my invention or process,

What I claim as new, and desire to secure by Let ters Patent, is

1. The removing the blocks from the molds and covering them with sand orother material, so as to exclude the air during thecooling-process.

2. The excluding theiair from the blocks during the cooling-process, bycovering with sand or other material, whether the blocks are still leftin the molds or first removed. I

' CHAS, DIEBOLD. Witnesses:

J om: GLARMAN, AARON HOFFMAN).

